Stens Flat Idler Pulley for Exmark Lazer Z — Black Metal Direct-Fit, 8-3/4in OD 5/8in ID

If a worn or damaged idler pulley is causing belt slippage, noise, or poor mower performance, this Stens flat idler provides a direct-fit replacement designed for Exmark Lazer Z machines. Manufactured by an OEM supplier from corrosion-resistant metal, the idler matches the original outside diameter and center bore dimensions so installation is straightforward for technicians and DIYers.

How does this idler match original Exmark specifications?

The Stens 280-737 reproduces the critical measurements needed for a correct fit. It has an outer diameter, inner diameter, and mounting height aligned to the original part so it seats and spins like the factory component.

• Outer diameter (OD): 8 3/4" for consistent belt contact.
• Inner diameter (ID): 5/8" to fit standard shafts and bolts.
• Height and flange dimensions: 1" height and 1/4" flange detail for correct clearance.
• Overall depth/value V: 1 5/8" for belt alignment with pulleys.

Will this idler install easily on my Lazer Z mower?

Yes — the idler is designed to be a compatible replacement for Exmark part numbers 109-8590 and 116-9639, so it installs in the same mounting location without modification when your mower uses those OEM references. Typical installation requires basic hand tools and standard safety precautions.

• Direct-replacement for Exmark Lazer Z models listed under OEM numbers.
• Fits common 5/8" shafts/bolts used on Exmark idler mounts.
• Package contains one unit sized for original belt routing and tension.

What are the material and durability features to expect?

The pulley is metal-bodied to withstand loads and resist deformation under belt tension. Built by an experienced OEM supplier, it’s intended to offer reliable service life when installed and maintained correctly, but like all wear components it should be inspected periodically.

• Constructed from metal for strength and consistent shape retention.
• Suitable for typical lawn-mower operating loads and belt tensions.
• Packaged individually with dimensions and weight that reflect a robust component.

How do I confirm this part fits my mower before ordering?

Verify the Exmark OEM numbers on your existing idler or consult your mower’s parts diagram to confirm compatibility with 109-8590 or 116-9639. If dimensions or reference numbers differ, compare mounting bolt size and pulley diameters before purchase to avoid mismatches.

• Check your mower’s parts list for Exmark 109-8590 or 116-9639.
• Measure present idler: 8 3/4" OD and 5/8" ID to match this item.
• Confirm mounting bolt diameter and clearance match the 1" height and 1/4" flange.

Who is this for: Technicians, landscapers, or homeowners who maintain Exmark Lazer Z zero-turn mowers and need a dependable, OEM-compatible flat idler to restore correct belt tracking. Choose the Stens 280-737 when you require a metal, dimensionally accurate replacement for Exmark part numbers 109-8590 and 116-9639 and want a straightforward swap with common tools.